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Premonitory Martensitic Surface Relief Via Novel X-Ray Diffuse and Laser Light Reflectivity from The (001)-Surface of A Ni63Al37Single Crystal

Published online by Cambridge University Press:  15 February 2011

U. Klemradt*
Affiliation:
Univ. of Houston, Physics Dept., Houston, TX 77204-5506, USA
M. Aspelmeyer
Affiliation:
Univ. of Houston, Physics Dept., Houston, TX 77204-5506, USA Univ. München, Sektion Physik, Geschw.-Scholl-P1. 1, D-80539 Milnchen, Germany
H. Abe
Affiliation:
Univ. of Houston, Physics Dept., Houston, TX 77204-5506, USA
L.T. Wood
Affiliation:
Univ. of Houston, Physics Dept., Houston, TX 77204-5506, USA
S.C. Moss
Affiliation:
Univ. of Houston, Physics Dept., Houston, TX 77204-5506, USA
E. Dimasi
Affiliation:
Brookhaven National Laboratory, Physics Dept., Upton, NY 11973-5000, USA
J. Peisl
Affiliation:
Univ. München, Sektion Physik, Geschw.-Scholl-P1. 1, D-80539 Milnchen, Germany
*
Corresponding author. Present address: Univ. Miinchen, Sektion Physik, Geschw.-Scholl-P1. I, D-80539 Mhinchen, Germany. E-mail: uwe.klemradt@physik.uni-muenchen.de
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Abstract

Both x-ray diffuse reflectivity and laser light scattering have been used to investigate the temperature-dependent surface behavior of a Ni63Al37 single crystal on different length scales. In-situ experiments were performed above the conventional martensitic start temperature Ms to search for premartensitic phenomena. X-ray experiments showed the presence of a surface precursor with second-order (continuous) character several 10 K above Ms. This premonitory effect corresponds to a height-height-correlation function which changes on the nanometer scale as the martensitic transformation is approached. At the martensitic transformation, the surface morphology changed from nanoscopic roughness to macroscopic relief within a temperature interval of less than 1 K via intermediate stages. Laser light scattering was employed to study time-dependent aspects of the athermal martensitic transformation above Ms. The occurrence of a martensitic transformation on isothermal holding after a certain incubation period was observed in Ni-Al for the first time. The measured incubation times increased by four orders of magnitude within a temperature interval of 0.5 K.

Type
Research Article
Copyright
Copyright © Materials Research Society 2000

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Premonitory Martensitic Surface Relief Via Novel X-Ray Diffuse and Laser Light Reflectivity from The (001)-Surface of A Ni63Al37Single Crystal
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Premonitory Martensitic Surface Relief Via Novel X-Ray Diffuse and Laser Light Reflectivity from The (001)-Surface of A Ni63Al37Single Crystal
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Premonitory Martensitic Surface Relief Via Novel X-Ray Diffuse and Laser Light Reflectivity from The (001)-Surface of A Ni63Al37Single Crystal
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